Question

а)-3(2,1х-4)-4,2=1,2(5х+0,5)
б)6,4(2-3у)=6(0,8у-1)+6,8

Answer 1

6,4(2-3у)=6(0,8у-1)+6,8
12,8-19,2у=4,8у-6+6,8  
-19,2у - 4,8у= -6+6,8-12,8
-24у=-12
у= -12: (-24)
у= 0,5.

Answer 2

а)-3(2,1х-4)-4,2=1,2(5х+0,5)

Answer 3

х= 24